He said the demonstrators would “leave in a minute”, to which Corbyn replied there was no need and left the stage accompanied by shadow attorney general Baroness Chakrabarti.

He could then be heard asking “when did we condemn the bombings?”

When the protesters left shortly afterwards, Corbyn said: “Thank you for raising the issue, just to be absolutely clear in response to the point that Peter made, Emily Thornberry on our behalf, during Foreign Office Questions and on any other occasions has made is absolutely clear that we do think that aid should be given to people in Aleppo. We do think the bombing should end. We do think there should be a ceasefire. We do think there should be a political solution.

“We do think the war should end in Syria.”

Tatchell later told a Press Association reporter that the protest was an “act of desperation because we are so frustrated”.

In a statement issued by Syria Solidarity UK, Tatchell said: “On this day, politicians across the world have gathered to give speeches and celebrate the noble sentiments in the Universal Declaration of Human Rights.

“Yet in Aleppo, even as these words are being voiced, Syrian and Russian forces are targeting fleeing refugees, children in schools, doctors in hospitals, and paramedics from The White Helmets. In addition 200,000 civilians are being deliberately starved in Aleppo and over a million elsewhere in Free Syria.

“We call on the Labour Party to live up to its progressive rhetoric and actively push for aid drops.”